A simple counter routine

**mstembri** · Apr 3, 2001, 05:19

The idea here is the counter gets updated every time a user checks or unchecks a checkbox.

Obviously the way it's coded now only a 0 modulus will be returned. How can I init the variable count without setting it to zero every time the function is called?

Code:

function changeit() {
	var count = 0;
	count = count++;
     if (count%2 == 0) {
		document.forms[0].transmissionfirst.value = "00/00/0000"; 
		document.forms[0].transmissionlast.value = "00/00/0000"; 
	} else {
		document.forms[0].transmissionfirst.value = ""; 
		document.forms[0].transmissionlast.value = ""; 
	}
}

**scrubz** · Apr 3, 2001, 06:03

I'm not sure exactly what you're trying to do, but it sounds like you don't want the variable to restart at zero everytime the function is called? If so, you could store it in a hidden form field, since it looks like you're using a form anyway. When the function is called again, retrieve the hidden value and do as you please with it.

**mstembri** · Apr 3, 2001, 06:32

There is a form with a textbox and checkbox.

The textbox is blank by default.

When the user clicks the checkbox, the textbox is filled with $string (this part works fine, btw).

This is where I am - I need to be able to clear the textbox if the user clicks the checkbox a second time. And if it is clicked a third time, it will place $string in the textbox again, and so on...

**scrubz** · Apr 3, 2001, 07:29

Here's some code that should work. It increments the count each time - not sure if you wanted to do that or not. If not, it can be easily changed.

<html>
<head>
<title>Untitled</title>

<script language="JavaScript">

</script>
</head>

<body>
<form name="myForm" method="post" action="">

<input type="checkbox" name="addCount" onClick="countIt();">Add to count<br>
<input type="text" name="displayCount"><br>
<input type="hidden" name="theCount" value="1">

</form>
</body>
</html>

**mstembri** · Apr 3, 2001, 07:54

your script works fine, though it is not quite what I'm after.

The only reason I have the count routine in my script is to toggle on and off the $string variable, which will always remain the same (00/00/0000).

Code:

$count is initially set to zero.

When the user clicks the checkbox {
  $count = $count + 1;
  if $count%2 == 0 {
       '00/00/0000' will appear in the textbox
  } else if $count%2 == 1 {
       textbox is cleared, or given a value of '';
  }
}

What I'm doing is incredibly simple, I guess I'm doing a poor job at relaying my problem/request.

**scrubz** · Apr 3, 2001, 08:21

In that case, use the hidden variable I mentioned to store the value of the count. Replace these two lines in your original script:

var count = 0;
count = count++;

with this:

var count = parseInt(document.forms[0].theCount.value) + 1;

where 'theCount' is the name of the hidden form field that remembers the count.

So, count increments each time the checkbox is checked or unchecked, and if count is evenly divisible by 2, 00/00/0000 will appear in the textbox.

Do I have a grip yet?

**mstembri** · Apr 3, 2001, 09:40

Try this:

http://www.georgiaoffroad.com/www.html

The counter isn't being updated...

**scrubz** · Apr 3, 2001, 10:04

My fault.

Here are the first two lines for the script:

document.forms[0].theCount.value = parseInt(document.forms[0].theCount.value) + 1;
var count = parseInt(document.forms[0].theCount.value) + 1;

So first we increment the counter, then assign the variable 'count' to that value.

You've got the second line in there, but it's commented, so make sure you remove the comment. This should work for you.

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